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Defined Benefit Pension Plans and Other Post-Employment Benefit Plans - Net Period Benefit Costs (Income) for Post-retirement Employee Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Components of net periodic benefit cost:        
Interest cost $ 6.9 $ 7.0 $ 13.6 $ 14.0
Amortization of net prior service credit and net actuarial gain     0.1 0.1
Net periodic benefit cost 1.8 1.9 3.4 3.9
Other post-retirement employee benefit plans        
Components of net periodic benefit cost:        
Interest cost 0.3 0.4 0.7 0.8
Amortization of net prior service credit and net actuarial gain (0.2) (0.1) (0.3) (0.2)
Net periodic benefit cost $ 0.1 $ 0.3 $ 0.4 $ 0.6